Two issues from review:
1. BillingController::checkout was setting plan_id immediately after
creating the Stripe Checkout session, before the user actually paid.
If the user abandoned checkout, the account ended up with a plan it
never paid for. Plan activation is now driven exclusively by the
customer.subscription.created webhook, which fires only after a
successful payment.
2. The 'if (\$account->wasChanged('plan_id')) { ... }' guards around
forgetPlanFeatureCache() were tautological — Eloquent's update()
already short-circuits when nothing changed, and Pennant forget()
is idempotent, so an extra cache clear when the plan didn't move
is harmless. Removing the guards keeps the listener and swap path
readable.
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